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Meeting 2018 TMS Annual Meeting & Exhibition
Symposium Coupling Experiments and Modeling to Understand Plasticity and Failure
Presentation Title On the Role of Casting Pores in the Fatigue Damage Process of a Cast Aluminium Alloy
Author(s) Marcel Wicke, Martin Luetje, Inigo Bacaicoa, Angelika Brueckner-Foit
On-Site Speaker (Planned) Marcel Wicke
Abstract Scope Fatigue failure of cast components is typically caused by cracks initiated at internal defects as the surface region is defect free. Although this effect is well-known, systematic investigations are rare due to the tremendous efforts associated with sample production and preparation. Here, we present such a systematic investigation on an Al-Cu-Si alloy. Specimens were manufactured by die-casting without additional machining to analyze the role of casting pores during fatigue damage process in detail. More specifically, the three-dimensional morphology and spatial distribution of these defects was determined using X-ray computed tomography (µ-CT). Reconstruction shows that complex-shaped shrinkage pores are typically accompanied by high numbers of regular-shaped gas pores. Fatigue tests performed subsequently indicate that usually multiple cracks are initiated from shrinkage pores and lifetime is reduced considerably if gas and shrinkage pores interact. These findings are confirmed by EBSD experiments and µ-CT analysis, which clearly give evidence for secondary internal cracks.
Proceedings Inclusion? Planned: Supplemental Proceedings volume

OTHER PAPERS PLANNED FOR THIS SYMPOSIUM

A Direct Connection between In-situ TEM and Dislocation Simulations
A Survey of Several High-energy X-ray Diffraction Studies and Implications for Models of Polycrystal Plasticity
Challenges with Virtual Sample Instantiation for Prediction of Strain Localization and Crack Initiation in Polycrystalline Ni- and Ti-base Alloys
Characterizing the Effects a Smooth Crystal Lattice Orientation Field Formulation Has on the Evolution of Intragrain Deformation
Comparison of Parameters Required for Computational Models for Modeling Heterogeneous Deformation in Titanium Obtained with Different Approaches
Concurrent Multi-scale Modeling: Towards a Procedure to Test Modeling Hypothesis at the Mesoscale
Continuum Dislocation Dynamics at Finite Deformation and the Path toward Localization and Failure in Metals
Coupled Experiment and Modelling to Study Grain Orientation and Interaction Effects. Part 2
Coupled Experiment and Modelling to Study Grain Orientation and Interaction Effects. Part 1
Coupled Intergranular and Transgranular Fracture Modes in H.C.P. Alloys
E-10: Investigation of Deformation Mechanisms in Columnar Aluminum
E-11: Mechanism-based Modeling of Solute Strengthening: Application to Thermal Creep in Zr Alloy
E-12: Molecular Dynamics (MD) Evaluation of the Effect of Titanium Oxide Stoichiometry on Fracture
E-13: New Approach for Modeling Texture Effect on Macroscopic Plastic Properties of Metals
E-14: Rate Processes in Dislocation Dynamics: Effects on Dislocation Microstructure and Comparison with X-ray and TEM Data
E-15: Strain Bursts Induce Quasi-elastic Non-linear Average Response in Nanopillar Compression
E-16: Strain Field Mapping and Modeling Around Laser-induced Keyhole Defects in Ti-7Al under Cyclic Loading
E-17: Using Machine Learning Approaches towards Quantifying the Deformation History of Crystals: Examples from Discrete Dislocation Dynamics
E-1: A Domain Decomposition Parallel Implementation of an Elasto-visco-plastic Fast Fourier Transform Micromechanical Solver with Spectral Database Constitutive Representation
E-2: An Image Based Finite Element Model for Ni-based Superalloys Using a Two Scale Constitutive Model Accounting for Morphological Distributions of γ’ Precipitates
E-3: Annealing-detwinning due to Thermal Fluctuation of Incoherent Twin Boundary
E-4: Finite Element Simulation of Global Plastic Behavior of Supercritical CO2 Exposed P91 Metal-weld under Tensile Loading
E-5: Grain-scale Investigations of Deformation Heterogeneities in Aluminum Alloys
E-6: In-situ Characterization of Microstructural Damage in QP980 Steel
E-7: In Situ Mechanics at Atomic Scale – Experimental vs. Computational Molecular Dynamics
E-8: Influence of the Aluminum Microstructure in Electronic Components on their Failure Behavior: Experiments and Crystal Plasticity Simulations
E-9: Internal State Variable Plasticity-damage Modeling of AISI 4140 Steel Including Microstructure-property Relations: Temperature and Strain Rate Effects
Experimental and Computational Analysis of Deformation in Solid Solution and Precipitation Strengthened Ni-Cr-Co Alloys
Facile Measurements of Elastic Constants for Coupling Experiments and Modeling to Understand Plasticity and Failure
Geometrically Necessary Dislocations (GNDs) and Crystal Plasticity in HCP Metals
Improved Understanding of the Portevin–Le Chātelier Effect though Modelling Using Discrete Diffusion Coupled with Discrete Dislocation Dynamics
Integrated Micromechanical Approaches to Understand Dwell Fatigue: Crystal and Discrete Dislocation Plasticity Modelling
Integrated Micromechanical Approaches to Understand Dwell Fatigue: In-situ Experiments from the Micro-scale Upwards
Integrating High Energy Diffraction Microscopy Data with Crystal Plasticity Models for Strength and Damage
Localized Deformation Fields in Hexagonal Close-packed Polycrystals
Measurements and Crystal Plasticity Simulations of Microstructure-scale Deformation in Tantalum
Mechanical Behavior of Polycrystalline Microscale Silver Pillars
Microstructure and Texture Evolution during Thermo-mechanical Processing of Low-symmetry Metals
Microstructure Evolution during Biaxial Load Path Changes: In-situ Experiments and Multi-scale FE-FFT Modeling
Microstructure Sensitive Crack Nucleation in PM Ni Alloys
Neighbour Effects on Grain Resolved Stress Distributions in Hexagonal Metals Revealed by 3D X-ray Diffraction Measurements
New Observations of Phase Transformations during Deformation in Superalloys and High Entropy Alloys: Experiments
New Observations of Phase Transformations during Deformation in Superalloys and High Entropy Alloys: Modeling
On the Role of Casting Pores in the Fatigue Damage Process of a Cast Aluminium Alloy
Opportunities for Validation of Grain-Level Plasticity and Fatigue Crack Growth Using High Energy X-ray Diffraction Microscopy; Part 1: Experimental Methods
Opportunities for Validation of Grain-Level Plasticity and Fatigue Crack Growth Using High Energy X-ray Diffraction Microscopy; Part 2: Modeling Development and Considerations
Plasticity of BCC Metals at Low Temperatures - Coupling Theory with Experiments
Reliability of Slip Resistance Determination in Hexagonal Materials
Simulation Study on Plasticity and Fracture in Aluminum Based on Real Microstructures
Study of the Deformation of Mg-Y by In Situ EBSD and Visco-plastic Self-consistent Modeling
The Effect of Temperature on Deformation of CP-Ti
The Importance of Introducing Probabilistic Information When Modeling the Constitutive Response of Aggregates (Part II)
The Importance of Introducing Probabilistic Information When Modeling the Constitutive Response of Aggregates (Part I)
The Influence of Elastic Interactions on Local Stresses and Deformation Mechanism during Tensile Loading of Two-phase Titanium Alloys
Understanding Plastic Deformation in Polycrystals 301L Stainless Steel(301L SS) Using Far Field High Energy Diffraction Microscopy (HEDM) Experiments
Understanding Shear Band Formation Using High-resolution X-ray Diffraction and Numerical Modeling
Understanding the Fatigue Response of Each Crystal within a Copper Aggregate
Using 3D Microstructure Characterization to Study the Mechanics of Polycrystalline Materials

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